Question

Give reasons for the following scenarios:
(A) A balloon collapses when air is removed from it.
(B) water does not run out of a dropper unless its rubber bulb is pressed.
(C) two holes are made in a sealed oil to take out the oil from it.

Answer 1

Hint:(A)we know air occupies space and has weight. Also, air all above us exert force on everything around us and so the pressure known as atmospheric pressure comes into play.
(B) When the pressure at two surfaces are equal then nothing happens and the system remains in equilibrium. Also, from Pascal's law of pressure, pressure in a liquid is transmitted equally in all the directions.
(C) Many times even after the removal of the separating media gases does not come out of the small area because of the equilibrium being maintained on account of pressure difference.

Complete step by step answer:
(A) When air is allowed to escape from the balloon, the balloon collapses and as air rushes out following Newton’s third law, the balloon moves. On account of atmospheric pressure which is more outside as comparison to inside of the balloon collapses.
(B) When we press the dropper and dip it in water it sucks in water and due to atmospheric pressure acting on the water inside the dropper the water does not come out of its own of the dropper. On pressing the dropper inside pressure of water becomes more than outside atmospheric pressure and water comes out.
(C) We need to make two holes and not just one because through one-hole air gushes in which presses the oil and through a second hole oil comes out. This happens because of the pressure difference.

Note: Pressure difference plays a very important role in our life. One of the most important principles called Bernoulli’s theorem tells us the importance of pressure being played in our life.